[mythtvnz] Sky STB internal DC voltage.
criggie
criggie at criggie.org.nz
Sat Aug 4 14:40:01 BST 2012
On 04/08/12 21:53, yuri wrote:
> On 3 August 2012 19:40, Paulgir wrote:
>> A friend has asked me if I can build a 12V to whatever supply to make a
>> Sk...... STB mobile (I know Sky don't like their STBs "migrating").This is
>> for use in a camper.
>
> Any reason why they don't just put an inverter in the camper?
> An inverter would allow them to plug in any 230V appliance.
Two reasons
1) Inverting to 230V AC then rectifying back to 12V DC is a waste of
power, which is important if you're off the grid. Not so much if you're
in a caravan park with power.
2) Inverters don't generally create the cleanest AC wave form. Mine
puts out a two step square wave, which is enough to make a CRT buzz, and
also made the magic smoke come out of a watt-meter
There are special DVD/VHS players and TVs/monitors which have 12V DC in
and are designed to work in a caravan. I doubt many are
freeview-compliant though.
--
Criggie
http://criggie.org.nz/
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